The answer depends on what you are referring to. One can install larger wiper blades to cover more area. If you do this you may find the wipe is not as clean as the stock length. It all depends on the windshield.
If you are referring to the stroke length (left/right), this can not be changed. This is determined by the motor arm that connects the motor to the wiper lever arm (behind the front body). There are two strokes involved. One is on the motor and the other on the wiper arm.
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